Re: [ubuntu-uk] Some advice - permissions
2009/5/25 Lucy lucybrid...@gmail.com: 2009/5/20 Neil Greenwood neil.greenwood@gmail.com: If you create more than one user in each installation, you have to create them in the same order so that they get the same UIDs - if you don't, this is the only time you should have to use the chown/chgrp commands, although chown will change group too (just to confuse you even more!). FWIW, chown won't change the group by default. e.g chown -R fred /home/bob Will change the ownership of all bob's files to fred, but not the group. Whereas chown -R fred:fred /home/bob or, as a shortcut: chown -R fred: /home/bob Will change both the owner and the groups. -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/ Lucy, Thanks for clarifying. That's what I'd said in my head, but re-reading it I wasn't as clear as I wanted to be. :-) Cofion, Neil. -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/
Re: [ubuntu-uk] Some advice - permissions
2009/5/20 Neil Greenwood neil.greenwood@gmail.com: If you create more than one user in each installation, you have to create them in the same order so that they get the same UIDs - if you don't, this is the only time you should have to use the chown/chgrp commands, although chown will change group too (just to confuse you even more!). FWIW, chown won't change the group by default. e.g chown -R fred /home/bob Will change the ownership of all bob's files to fred, but not the group. Whereas chown -R fred:fred /home/bob or, as a shortcut: chown -R fred: /home/bob Will change both the owner and the groups. -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/
Re: [ubuntu-uk] Some advice - permissions
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Matthew Daubney wrote: On Tue, 2009-05-19 at 11:01 +0100, Sean Miller wrote: Should have broadband again today, so going to download an ISO and endeavour to fix my broken Jaunty. Now, a week or so ago somebody said to me that to preserve my data I simply asked it not to format the partition, which would leave /home intact. Two questions :- a. are there any potential side-effects to this (eg. files left from the corrupt version that interfere with the new one)? b. should I set up the default username as something different to the original (ie. if I use the same username could it decide to delete and recreate the user, thus blanking the home directory)? Hi Shaun, As with anything it'll be best to back up anything important first (always always do this, never trust ANYTHING completley). a) You may have one or two artifacts left over from the old install, but you will be able to fix this fairly easily as each one is identified. b) Use the same user, it'll be fine. Remember, BACKUPS! -Matt Daubney regarding point B, if you create a new users then won't this cause permission issues, as say old system has /home/paul and the new install has /home/paul2 the files will still belong to paul, and will need to have ownership changed (chown) and (chgrp) so you can read as the new user. Just a thought, but this is something to perhaps consider, comments welcome in case I have perhaps mis understood something. I have my files on a different partition which makes sense, but you also make a good point regarding back ups. Paul - -- Paul Sutton www.zleap.net Support Open and ISO standard file formats ISO 26300 odf http://www.odfalliance.org Next Linux User Group meet :Saturday ** June 6th ** : 3pm, Shoreline Cafe Paignton -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkoT+bkACgkQaggq1k2FJq3UYQCcD6rGWCWsYd4O4YRsWC8vt/tP L9IAni3OEGAWAqAa97/UqLoae0ma50Od =Jkgf -END PGP SIGNATURE- -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/
Re: [ubuntu-uk] Some advice - permissions
2009/5/20 Paul Sutton zl...@zleap.net: regarding point B, if you create a new users then won't this cause permission issues, as say old system has /home/paul and the new install has /home/paul2 the files will still belong to paul, and will need to have ownership changed (chown) and (chgrp) so you can read as the new user. Just a thought, but this is something to perhaps consider, comments welcome in case I have perhaps mis understood something. I have my files on a different partition which makes sense, but you also make a good point regarding back ups. Hi Paul, It gets a bit more complicated than this! The filesystem stores the user and group for each file as a numeric ID. Then the /etc/passwd and /etc/groups files provide a cross-reference for converting the numeric ID into a user (or group) name and vice versa. When you create a user on a new installation, it uses the first free numeric ID above a fixed offset (which I believe is 1000 for Ubuntu). So in the original installation, user 'paul' probably has a numeric ID (UID) of 1000. In the new installation, user 'paul2' probably has a UID of 1000 too, since the new installation knows nothing about the previous user called 'paul', apart from some files in the /home partition belonging to a UID of 1000. If you create more than one user in each installation, you have to create them in the same order so that they get the same UIDs - if you don't, this is the only time you should have to use the chown/chgrp commands, although chown will change group too (just to confuse you even more!). Clear as mud? Cofion/Regards, Neil. -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/
